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Materials (Basel). 2014 Oct 29;7(11):7226-7242. doi: 10.3390/ma7117226.

Organic Field-Effect Transistors Based on a Liquid-Crystalline Polymeric Semiconductor using SU-8 Gate Dielectrics onFlexible Substrates.

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Research Center for Microperipheric Technologies, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany.
Fraunhofer Research Institution for Modular Solid State Technologies EMFT, Hansastr. 27d, 80686 Munich, Germany.
Electronics Packaging Lab (IAVT), Technische Universität Dresden, Helmholtzstr. 10, 01069 Dresden, Germany.


In this work, the insulating properties of poly(4-vinylphenol) (PVP) and SU-8 (MicroChem, Westborough, MA, USA) dielectrics are analyzed and compared with each other. We further investigate the performance behavior of organic field-effect transistors based on a semiconducting liquid-crystal polymer (LCP) using both dielectric materials and evaluate the results regarding the processability. Due to the lower process temperature needed for the SU-8 deposition, the realization of organic transistors on flexible substrates is demonstrated showing comparable charge carrier mobilities to devices using PVP on glass. In addition, a µ-dispensing procedure of the LCP on SU-8 is presented, improving the switching behavior of the organic transistors, and the promising stability data of the SU-8/LCP stack are verified after storing the structures for 60 days in ambient air showing negligible irreversible degradation of the organic semiconductor.


liquid-crystal polymers; long-term stability; organic field-effect transistors; organic semiconductor

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